JPH0538720U - Flex resistance shielded cable - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the bending resistance of shielded cables. [Structure] A tape 7 is wound around and wound around a core c formed by twisting a plurality of flexible insulating core wires 6, a shield layer 8 is provided thereon, and a jacket 9 is provided around the shield layer 8. In the bend-resistant shielded cable, the conductor 4 of the flexible insulating core wire 6 is made of the following copper alloy wire, and the shield layer 8 is
A copper foil tape or a copper alloy foil tape described below is horizontally wound around a high tensile strength fiber thread, and is wound or braided on the press winding layer 7. Note that Fe is 0.02 to 0.7% by weight, and P is 15 with respect to Fe.
A high-strength and high-conductivity copper alloy containing 80 to 80% by weight, 0.01 to 0.5% by weight of Zr and In respectively or 0.01 to 0.5% by weight in total, and the balance being copper. The copper alloy wire is excellent in bending resistance, and the shield layer 8 has a foil thread forming the wire that expands and contracts in the length direction and the radial direction, and in combination with the characteristics of the high tensile strength fiber thread. And maintain sufficient flex resistance. Therefore, the bending resistance of the entire cable is high.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flex resistant shielded cable such as a cable for a robot that is repeatedly bent and eliminates the influence of noise.

[0002]

[Prior art and its problems]

 Since this type of cable is used for moving parts, it is required that it is difficult to break due to bending, twisting, vibration, etc.In general, an insulating coating is provided on a flexible stranded conductor to form an insulating core wire, A tape is wound around a core formed by twisting a plurality of the flexible insulating core wires and wound around the core, a shield layer is provided on the tape, and a jacket is provided around the shield layer.

The conventional shield layer in this cable is made of annealed copper wire of 0.08 to 0.18 mmφ wound horizontally or braided on the press winding layer.

Here, when the cable is bent, the shield layer is located inside or outside of the conductor with respect to the center of the bend, so that the shield layer has a smaller bending ratio than the conductor. For this reason, in this type of cable, the shield layer was disconnected earlier than the conductor, and the shield effect was lost, which was a cause of runaway of robots and the like.

An object of this invention is to enhance the flex resistance of the shield layer and further enhance the flex resistance of the entire cable.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, in the present invention, first, in the shielded cable having the above-described configuration, the conductor of the flexible insulating core wire is made of one of the following copper alloys A to D. In addition, the shield layer is formed from a wire, and the shield layer is wrapped around a high-tensile-strength fiber thread with a copper foil or a tape of any one of the following copper alloys A to D. It was either horizontally wound or braided on top.

Note (A): 0.02 to 0.7% by weight of Fe, 15 to 80% by weight of P of P, 0.01 to 0.5% by weight of Zr or In, and balance of copper Copper alloy. (See JP-A-62-214144 and JP-A-63-196523).

(B) 0.02 to 0.7% by weight of Fe, 15 to 80% by weight of P relative to Fe, and two kinds selected from the group consisting of In, Sn, Pb and Sb, and Zr. A high strength and high conductivity copper alloy containing 0.01 to 0.5% by weight in total and the balance being copper. (See Japanese Patent Publication No. 62-214145).

(C) 0.02 to 0.7% by weight of Fe, 15 to 80% by weight of P relative to Fe, and 0.01 to 0.5% by weight of Zr and In in total, A high-strength and highly conductive copper alloy with the balance being copper. (See JP-A-62-214146, JP-B-63-196523, etc.).

(D) A rough drawn wire of a copper alloy in which the total amount of additive elements containing at least Fe and P is 0.05 to 2.0% by weight is heat-treated at an intermediate wire diameter up to the final wire diameter to produce Fe-P. A high-strength and high-conductivity copper alloy wire that has been cold-drawn to the final wire diameter after precipitation of the compound.

The high-strength and high-conductivity copper alloy having the composition (A) to (D) preferably has an O ₂ content of less than 50 ppm, and the recrystallization structure of the composition metal is 50% or less. And the preferred P content is about 28% by weight of Fe. It is advisable to subject the above-mentioned cold drawn final warp to a heat treatment.

The high tensile strength fibers include various synthetic fibers such as polyester synthetic fibers (for example, Tetron: Teijin Ltd. trade name), aromatic polyamide fibers (for example, Kevlar: DuPont USA trade name), and natural fibers. Is appropriately selected.

In the above cable, the shield layer may be each copper alloy foil thread, and the flexible conductor may be a copper wire, and the flexible conductor may be each copper alloy wire, copper foil thread or copper alloy foil. The yarn and the shield layer may be formed by weaving or braiding a wire made of each copper alloy. Further, the flexible conductor may be formed of copper foil thread or each copper alloy foil thread.

[0014]

[Action]

 In the cable according to the present invention having such a structure, first, the copper alloy having the above-mentioned compositions A to D forming the flexible conductor or the shield layer is formed as described in JP-A-62-214144. It has excellent bending resistance and is comparable in conductivity to pure copper. For example, in the fatigue characteristics, under the condition that the bending strain is 0.306%, the number of bending and rupture of the wire made of the copper alloy is 1610,000 times, whereas that of the pure copper wire is about 43,000 times and about 4 minutes. 1 and the bending strain of 0.22%, the copper alloy wire: 31.5 million times or more, the pure copper wire: about 1193,000 times, about 1/260 or less, and the bending strain of 0.18%. Then, the copper alloy wire: 62 million times or more, and the pure copper wire: about 218,000 times, which is about 1/280 or less.

Further, the copper foil yarn or the copper alloy foil yarn expands and contracts in the length direction and the radial direction, and maintains sufficient bending resistance in combination with the characteristics of the high tensile strength fiber yarn.

Therefore, the cable formed of the flexible conductor and the shield layer made of a combination of the copper alloy or the foil yarn, which retains these sufficient bending resistance, has excellent bending resistance.

[0017]

【Example】

 First, with the structure shown in Table 1, as shown in FIG. 2, a pure copper foil tape 2 was horizontally wound around a Tetoron yarn 1 to produce a copper foil yarn 3.

On the other hand, polytetrafluoroethylene (PTFE) 5 is extrusion-molded onto the 40 / 0.08 mm copper alloy aggregate stranded wire 4 having the composition of (A) described above to obtain a 0.2 mm ² insulating core wire. 6 was manufactured (see FIG. 1).

[0019]

[Table 1]

Next, the insulated core wire 6 is twisted into two cores to form a “pair” a, and a plurality of “pairs” a are collectively twisted to form a cable core (core) c, on which a press winding layer 7 is formed. , A shield layer 8 and an outer jacket 9 made of polyurethane elastomer were sequentially provided to obtain a cable P according to the present invention shown in FIG. At this time, the shield layer 8 is formed by winding the copper foil thread 3 horizontally (FIG. 4) or braiding (FIG. 5).

Here, interference between the “pair” a may occur depending on the use of the cable P. In such a case, a shield layer 10 is provided for each "pair" a, and the strands are collectively twisted to form a cable core c, on which a press winding layer 7, a shield layer 8 and an outer jacket 9 are sequentially provided. You can also At this time, the shield layer 10 of the pair a is also formed by the horizontal winding or braiding of the copper foil thread 3.

On the other hand, as a comparative example, conductor 4: pure copper wire, shield layer 8: 0.12 mmφ soft copper wire braid (Comparative Example 1), conductor 4: high-strength copper alloy wire A, shield layer 8: 0.12 mmφ Horizontal winding of soft copper wire (Comparative Example 2), conductor 4: high-strength copper alloy wire A, shield layer 8: 0.12 mmφ soft copper wire braid (Comparative Example 3), conductor 4: high-strength copper alloy wire A, shield Layer 8: A 0.08 mmφ annealed copper wire was horizontally wound (Comparative Example 4), and a cable P having the same configuration as that of the other examples was also manufactured.

[0023]

[Table 2]

The lower column of Table 2 shows the results of the bending test shown in FIG. 6 for the cables P of Examples 1 and 2 and each comparative example under the following conditions.

Bending angle: ± 90 degrees Bending radius R: 6 mm Load W: 1 kg Bending speed: 40 times / minute (left and right are counted as one each).

From these results, it can be understood that the flexural resistance of the shield layer 8 of each of the examples is remarkably superior to that of the comparative example.

Further, as shown in FIG. 3, the conductor 4 of the insulating core wire 6 is replaced with the copper alloy foil thread 3 having a 0.1 mmφ wire of the above copper alloy A as a bus bar in place of the copper wire in the configuration shown in Table 1 above. A cable P having the same structure as in Examples 1 and 2 was manufactured by using 7 twisted wires, and the above bending test was conducted. As a result, the conductor 4 was still 1 after being bent for 1,900,000 times. The core wire did not have any disconnection.

Further, a cable P having the conductor 4 formed of the copper foil thread 3 and the shield layer 8 formed by winding or braiding the wire or foil thread of the copper alloy A is manufactured, and the bending test is performed in the same manner. As a result, the breakage of the shield layer 8 was prevented by the excellent bending resistance of the copper alloy, and the conductor 4 and the shield layer 8 obtained the same results as in Examples 1 and 2.

In addition, in the above-mentioned embodiment, when each of the copper alloys of (B), (C) and (D) was used for the conductor 4 or the shield layer 8 instead of the composition (A), the same effect was obtained. In addition, when the composition of claims 5, 6, and 7 was used, the bending resistance and the conductivity were further improved.

Although PTFE is used for the insulator 5 of the insulating core wire 6 in the above embodiment, polyvinyl chloride (PVC), cross-linked polyethylene, ethylene propylene rubber, etc. are used in addition to this, and the jacket 9 is made of polyurethane. Instead of the elastomer, PVC, chloroprene, polyester elastomer or the like can be used.

[0031]

[Effect of the device]

 Since the present invention is configured as described above, there is an effect that the bending resistance of the conductor and the shield layer of the insulating core wire is significantly improved, and a highly reliable cable can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

[Figure 2] Front view of copper foil thread

FIG. 3 is a conductor cross-sectional view of an insulated core wire.

FIG. 4 is an explanatory diagram of the structure of a shield layer.

FIG. 5 is an explanatory diagram of the structure of the shield layer.

[FIG. 6] Bending test explanatory diagram

[Explanation of symbols]

 1 High Tensile Fiber Yarn (Tetoron) 2 Copper Foil Tape (Copper Alloy Foil Tape) 3 Copper Foil Yarn (Copper Alloy Foil Yarn) 4 Flexible Conductor (Assembled Stranded Wire) 5 Insulation Coating (PTFE) 6 Insulated Core Wire 7 Presser Winding layer 8 Shield layer 9 Outer sheath (sheath) P Cable c Core (cable core)

Front page continued (72) Inventor Osamu Ehara 2-3-1 Iwata-cho, Higashi-Osaka City Tatsuta Electric Wire Co., Ltd. (72) Inventor Kenji Harada 2-3-1 Iwata-cho, Higashi-Osaka City Tatsuta Electric Wire Co., Ltd. In the company

Claims (15)

[Scope of utility model registration request] 1. A flex resistance in which a tape is wound around a core formed by twisting a plurality of flexible insulating core wires and is wound up, a shield layer is provided thereon, and a jacket is provided around the shield layer. In a shielded cable, the conductor of the flexible insulated core wire is made of the following copper alloy wire, and the shield layer is wrapped with a copper foil tape in which copper foil tape is wound around a high tensile strength fiber thread. A bend-resistant shielded cable, which is formed by winding it horizontally on a layer. Note: Fe is 0.02 to 0.7% by weight, and P is 15 with respect to Fe.
~ 80% by weight, 0.01 to 0.5% by weight of Zr or In
A high-strength, high-conductivity copper alloy containing and the balance being copper. 2. The bend-resistant shielded cable according to claim 1, wherein the conductor is made of a wire of the following copper alloy. Note: Fe is 0.02 to 0.7% by weight, and P is 15 with respect to Fe.
˜80 wt%, and two kinds selected from the group consisting of In, Sn, Pb, and Sb and Zr in a total amount of 0.01 to 0.
A high-strength and high-conductivity copper alloy containing 5% by weight and the balance being copper. 3. The bending resistant shielded cable according to claim 1, wherein the conductor is made of a wire of the following copper alloy. Note: Fe is 0.02 to 0.7% by weight, and P is 15 with respect to Fe.
˜80% by weight, and the total amount of Zr and In is 0.01˜
A high-strength and high-conductivity copper alloy containing 0.5% by weight and the balance being copper. 4. The bend-resistant shielded cable according to claim 1, wherein the conductor is made of the following copper alloy wire. Note that the total amount of additional elements containing at least Fe and P is 0.05
Approximately 2.0% by weight of a copper alloy wire is heat-treated at an intermediate wire diameter up to the final wire diameter to precipitate an Fe-P compound, and then cold drawn to the final wire diameter. Copper alloy wire. 5. The bending resistant shielded cable according to claim 4, wherein the copper alloy wire is a cold drawn wire having a final wire diameter and subjected to heat treatment. Sex shielded cable. 6. The bending resistant shielded cable according to claim 1, wherein the copper alloy forming the flexible conductor has a recrystallization structure of 50% or less. Flexible shielded cable. 7. The flex resistant shield cable according to claim 1, wherein the copper alloy forming the flexible conductor has an O ₂ content of less than 50 ppm. Flexible shielded cable. 8. The bend-resistant shielded cable according to claim 1, wherein the shield layer is formed by braiding the copper foil thread on the press-winding layer. Bend resistant shielded cable. 9. A flex resistance in which a tape is wound around a core formed by twisting a plurality of flexible insulating core wires and is wound up, a shield layer is provided thereon, and a jacket is further provided around the shield layer. In a shielded cable, the conductor of the flexible insulated core wire is made of the copper alloy wire according to any one of claims 1 to 7, and the shield layer is provided around the high tensile strength fiber yarn. 7. A bend-resistant shielded cable, which is formed by horizontally winding a copper alloy foil thread, which is obtained by horizontally winding the copper alloy foil tape according to any one of 1 to 7, on a press winding layer. 10. The flex-resistant shielded cable according to claim 9, wherein the shield layer is formed by braiding each of the copper alloy foil yarns on the pressing winding layer. Shielded cable. 11. The flex-resistant shielded cable according to claim 9, wherein the conductor of the flexible insulating core wire is formed by a copper foil thread in which a copper foil tape is wound around a high tensile strength fiber thread. A flexible cable that is flexible. 12. The flex-resistant shielded cable according to claim 9, wherein the conductor of the flexible insulating core wire is wrapped around a high tensile strength fiber yarn. A bend-resistant shielded cable, which is formed by horizontally winding a copper alloy foil tape of 1. 13. A flex resistance in which a tape is wound around a core formed by twisting a plurality of flexible insulating core wires and is wound up, a shield layer is provided on the tape, and a jacket is further provided around the shield layer. In the shielded cable, the conductor of the flexible insulating core wire is formed by a copper foil thread in which a copper foil tape is wound around a high tensile strength fiber thread, and the shield layer is formed according to any one of claims 1 to 7. A bend-resistant shielded cable, which is formed by horizontally winding the copper alloy wire described in 1 above on a press winding layer. 14. The bend-resistant shield cable according to claim 13, wherein the shield layer is formed by braiding wires of the copper alloys on the press-winding layer. cable. 15. The bend resistant shielded cable according to any one of claims 1 to 8, 13 and 14, wherein the conductor of the flexible insulating core wire is around the high tensile strength fiber yarn.
A bend-resistant shielded cable, which is formed from a copper alloy foil yarn wound horizontally with the copper alloy foil tape according to any one of claims 1 to 7.